On September 7, 2021, the ACLU submitted comments to the Patent Trademark Office for its study on patent eligibility jurisprudence. The information in this comment shows that: (i) Federal Circuit and Patent Trial and Appeals Board (PTAB) affirmance rates indicate that district courts, the PTAB, and patent examiners clearly and consistently apply Supreme Court jurisprudence regarding patent subject matter eligibility; (ii) Federal Circuit judges believe that the law is clear and furthermore, decision makers benefit from the guidance provided by the more than 77 cases heard since Alice; and (iii) expanding subject matter eligibility would raise constitutional concerns.